Combine rice and water in a saucepan, and bring to a boil. Reduce heat to low, cover, and simmer for 35 to 40 minutes, or until tender. Remove from heat, and cool.

Place black beans and pinto beans into a colander or strainer, and rinse. Add corn and diced tomatoes with green chilies, and toss to mix. Transfer to a large bowl, and mix in rice and cheese.

Divide the mixture evenly among the tortillas, and roll up. Wrap individually in plastic wrap, place into a large freezer bag, and freeze. Reheat as needed in the microwave for lunch or snacks.

Thinly slice brussel sprouts and place them in a bowl. Mix with apples and walnuts (optional: to bring out a more earthy flavor in the walnuts, you can toast them in a skillet over medium heat for 1-2 minutes).

In a small bowl make the vinaigrette by mixing together the olive oil, apple cider vinegar, maple syrup, and a pinch of salt/pepper.

Drizzle vinaigrette over the salad and serve.